Medium

CVE-2024-12243 — Gnutls: gnutls impacted by inefficient der decoding in libtasn1 leading to remote dos

A flaw was found in GnuTLS, which relies on libtasn1 for ASN.1 data processing. Due to an inefficient algorithm in libtasn1, decoding certain DER-encoded certificate data can take excessive time, leading to increased resource consumption. This flaw allows a remote attacker to send a specially crafted certificate, causing GnuTLS to become unresponsive or slow, resulting in a denial-of-service condition.

Published Feb 10, 2025 · Updated Oct 22, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: redhat

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 1.3% (30-day exploitation probability)+11
Technical severity (medium)+3
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

1.29%

ahead of 70% of scored CVEs · Oct 22, 2026

Affects

Red Hat

Red Hat Discovery 1.14 and 5 more

CVSS base

5.3

Medium · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Red Hat Red Hat Discovery 1.14, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9…).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Red Hat	Red Hat Discovery 1.14	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Red Hat	Red Hat Enterprise Linux 8	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Red Hat	Red Hat Enterprise Linux 9	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Red Hat	Red Hat OpenShift Container Platform 4	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
5.3	CVSS 3.1	Medium	3.9	1.4	secalert@redhat.com via NIST National Vulnerability Database
5.3	CVSS 3.1	Medium	—	—	GitHub, Inc. via GitHub Security Advisories
5.3	CVSS 3.1	Medium	—	—	redhat via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L (score shown at the top: secalert@redhat.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-407

Other CVEs with this weakness →

EPSS over time FIRST

Oct 21, 2026 → Oct 22, 2026 · 2 reading(s) · max 1.29%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Affected products removed · 1
Oct 22, 2026 · CVE Program (cve.org) e CISA ADP
Affected products added · red hat/red hat openshift container platform 4
Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
Affected products added · red hat/red hat enterprise linux 8, red hat/red hat enterprise linux 9, red hat/red hat enterprise linux 9.2 update serv
Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 21, 2026
CVSS changed · 5.3
Oct 21, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 21, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 21, 2026 · Alertas do Telegram
2025
CVE published
Feb 10, 2025 · redhat

Source activity

Repeated readings are counted rather than listed.

2× References added · Oct 21, 2026 – Oct 21, 2026
1× Official description updated · Oct 21, 2026 – Oct 21, 2026

References

16 on the record

access.redhat.com/errata/RHSA-2025:7076
vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
gitlab.com/gnutls/libtasn1/-/issues/52
NIST National Vulnerability Database
lists.debian.org/debian-lts-announce/2025/02/msg00027.html
NIST National Vulnerability Database
bugzilla.redhat.com/show_bug.cgi
issue-tracking, x_refsource_REDHAT, NIST National Vulnerability Database
cert-portal.siemens.com/productcert/html/ssa-082556.html
NIST National Vulnerability Database
security.netapp.com/advisory/ntap-20250523-0002/
NIST National Vulnerability Database
access.redhat.com/errata/RHSA-2025:8385
vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
access.redhat.com/errata/RHSA-2025:17361
vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
access.redhat.com/errata/RHSA-2025:8020
vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2024-12243
GitHub Security Advisories
access.redhat.com/errata/RHSA-2025:4051
vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
github.com/advisories/GHSA-cqj4-fp95-jqxq
GitHub Security Advisories
cert-portal.siemens.com/productcert/html/ssa-202008.html
NIST National Vulnerability Database
security.netapp.com/advisory/ntap-20250523-0002
GitHub Security Advisories
gitlab.com/gnutls/gnutls/-/issues/1553
NIST National Vulnerability Database
access.redhat.com/security/cve/CVE-2024-12243
vdb-entry, x_refsource_REDHAT, NIST National Vulnerability Database

Elsewhere on this site

Red Hat
every CVE for this vendor

CWE-407
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-115484 Open-iscsi: open-iscsi: dhcpv4 option parser heap out-of-bounds read in iscsiuio parse_msg 13h
High CVE-2026-115486 Open-iscsi: open-iscsi: ipv6 neighbor discovery missing option length validation in iscsiuio allows arp table poisoning 13h
Medium CVE-2026-115485 Open-iscsi: open-iscsi: dhcpv6 vendor option strlen heap out-of-bounds read and 1-byte write in iscsiuio 13h
Medium CVE-2026-115424 Oc: oc: symlink/hardlink target validation bypass in oc image extract allows file write outside destination 16h
Low CVE-2026-115449 Libslirp: libslirp: icmp echo reply length desynchronization leaks host ip to guest 16h
Medium CVE-2026-115221 Ipa: freeipa: freeipa uses subject cn as proof of certificate ownership 16h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2024-12243 is "Gnutls: gnutls impacted by inefficient der decoding in libtasn1 leading to remote dos", rated Medium. It affects Red Hat Discovery 1.14 (Red Hat); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.3 describes technical severity. EPSS 1.29% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.